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Debt Maturities (Details) - Debt [Member] - Kilroy Realty, L.P. [Member]
$ in Thousands
Sep. 30, 2015
USD ($)
Stated debt maturities and scheduled amortization payments, excluding debt discounts  
Remaining 2015 $ 327,768
2016 99,431
2017 71,748
2018 451,728
2019 265,370
Thereafter 1,441,643
Total 2,657,688 [1]
Unamortized premium $ (400)
[1] Includes gross principal balance of outstanding debt before impact of net unamortized discounts totaling approximately $0.4 million